Asia's longest-ruling leader said in a Facebook post that he got the positive result on arrival in Bali for a G20 summit, but was not experiencing any symptoms.

Sunak, who only took office three weeks ago, is due to hold formal bilateral meetings with US President Joe Biden and the leaders of Saudi Arabia, Japan and Australia. 

Leaders of the Group of 20 (G20) major economies open talks on Tuesday on the island of Bali, after a final pitch by host Indonesia for the bloc to focus on action to help a global economic recovery despite deep rifts due to the war in Ukraine.

"We are working very hard to ensure that we not only make clear, important statements on all the issues that affect the world together... but also on the issues of peace and the consequences of the Russian war of aggression on Ukraine," Scholz said during a joint news conference with Singapore's prime minister, Lee Hsien Loong, in Singapore.

The world's biggest rainforest nations Brazil, Indonesia and the Democratic Republic of Congo on Monday formally launched a climate partnership to work together on conservation.

British Prime Minister Rishi Sunak on Tuesday extended his support for Ukraine at the G20 summit and said that Russian President Vladimir Putin's regime will hear the chorus of global opposition to its actions.

Xi and Biden both sought to lower the temperature as they met for more than two hours on the resort island of Bali, with the presidents both saying they wanted to prevent high tensions from spilling over into conflict.

Fresh from securing a norm-breaking third term as Communist Party leader, Xi will have the wind at his back as he prepares to meet a string of powerful dignitaries in what is only his second overseas trip since early 2020.

He was taken to hospital for a "check-up" at the Sanglah hospital and he "immediately returned", said Bali Governor I Wayan Koster.

German Chancellor Olaf Scholz is expected to arrive in Bali on Monday evening for the summit of the G20 group of major economies after visiting Vietnam and Singapore in a mission to reinvigorate ties with the Indo-Pacific region.

Designed to be a replica of the Sheikh Zayed Grand Mosque in Abu Dhabi — the largest one in the country, Surakarta's new mosque, painted in white with gilt ornamentation, has four minarets and one main dome.

A joint study by Pertamina and Exxonmobil had found a potential carbon storage capacity of 1 billion tonnes in Pertamina's oil and gas fields, which could permanently store Indonesia's emissions for the next 16 years, Pertamina said in a separate statement on Sunday.

Bali’s Nusa Dua hotel enclave has been transformed into ground zero of Indonesia’s G20 presidency activities, with beefed-up security and a fleet of electric vehicles servicing thousands of participants.

Biden and Chinese counterpart Xi Jinping are on Monday set to meet face-to-face for the first time since Biden took office, as bilateral relations languish at their worst in decades. Jake Sullivan, a national security adviser to Biden, told reporters the meeting could last "a couple of hours".

Developing nations must have access to credit for economic growth without becoming reliant on "exploitative" lenders, Sunak is expected to tell the summit, echoing past G7 criticism of China.

It would be the first G20 Summit since Russia invaded Ukraine in February. Moscow calls its actions in Ukraine a special operation.

In a series of meetings between ASEAN countries and their Indo-Pacific partners on Saturday, President Joko “Jokowi” Widodo continued to advocate for regional peace and stability.

Albanese, whose Labor government is keen to scrape the ice off of Canberra's frosty relationship with Beijing, spoke to Li at a gala dinner on Saturday night at the Association of Southeast Asian Nations summit in Phnom Penh.

Addressing the East Asia Summit in Cambodia, Biden said the United States would compete with China and speak out over its human rights record, but stressed the importance of peace in the Taiwan Strait and ensuring freedom of navigation in the South China Sea. 

The President expects more financial support at the launch of the multi-million dollar fund.

Biden met Southeast Asian leaders in Phnom Penh ahead of his encounter with his Chinese counterpart on Monday in Bali.

Albanese and Li spoke on arrival at a gala on the sidelines of the summit in Phnom Penh of the Association of Southeast Asian Nations (ASEAN), the Australian Broadcasting Corporation reported. 

The Nov 15-16 summit is the first among G20 leaders since Russia invaded Ukraine in what Moscow has called a "special military operation", which is likely to be a major topic of conversation at the meeting.

"Now that we're back together here in Cambodia, I look forward to building even stronger progress than we've already made, and I want to thank the Prime Minister of Colombia for his leadership as ASEAN chair and for hosting all of us," Biden said while meeting his counterparts in the Association of Southeast Asian Nations in Phnom Penh.

Twitter Blue will probably "come back end of next week", billionaire owner Elon Musk said in a tweet on Saturday.

Southeast Asian heads of government held talks on Saturday with visiting global leaders including US President Joe Biden, who hailed the launch of a new US-ASEAN pact as a critical step towards tackling "the biggest issues of our time".

UN chief Antonio Guterres on Saturday urged the Myanmar junta to immediately return to democracy, saying it was the only way to stop the "unending nightmare" engulfing the country.

Ukraine's foreign minister on Saturday urged Southeast Asian countries to take all measures possible to stop Russia from playing "hunger games" over a Ukrainian Black Sea grain deal, which could expire next week.

US President Joe Biden landed in Asia on Saturday vowing to urge Chinese leader Xi Jinping to rein in North Korea when they hold their first face-to-face meeting at next week's G20 summit.

US Treasury Secretary Janet Yellen told Reuters on Friday that she plans to meet with China's central bank governor Yi Gang on the sidelines of the G20 Summit in Bali to discuss global economic conditions and China's property market situation.